Overhaul of dbmmanage to allow a groups arg (as in Apache 1.2)

 Overhaul of dbmmanage to allow a groups arg (as in Apache 1.2)
     as well as a comment arg to the add, adduser and update cmds.
     update allows the user to clear or preserve pw/groups/comment.
     Fixed a bug in dbmmanage that prevented the check option from
     parsing a password followed by :group... text.  Corrected the
     seed calcualation for Win32 systems, and added -lsdbm support.
     PR: 3810, 5527

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@86268 13f79535-47bb-0310-9956-ffa450edef68